LITTLETON, Colo. (CBS4)- The brothers who died just days apart after being found in a parked but running SUV near Powderhorn Ski Area will be remembered at a vigil in Littleton Thursday evening.

Tyler and William Jensen have both died.

Doctors determined Tyler, 4, was suffering from liver and kidney failure after the Nov. 27 incident, which authorities have released very few details about.

He was airlifted to Children’s Hospital in Denver and his younger brother William, 2, died at the scene. Tyler’s body will be returned to Mesa County for the autopsy.

Autopsy results on William have not been released. Mesa County Sheriff’s officials will only say they are referring to the case as a death investigation. There is no word so far on if there will be any charges.

The Grand Junction Sentinel reported that a resident doctor at The Children’s Hospital, where Tyler was taken, told investigators she did not believe he suffered carbon monoxide poisoning.

The paper obtained some documents before they were sealed, including an affidavit in which an investigator wrote there was probable cause to believe the crime of child abuse resulting in death had been committed, according to the paper’s reporting.

Jensen posted photos of the boys on her Facebook page hours after making the 911 call, saying “I miss my boys.”

The vigil is scheduled for 7 p.m. Thursday at Progress Park in Littleton.

(credit: CBS)